Unique cap which converts a cup into a high quality shaker



FIG. 1 is an isometric view of the cap with a cup shown in phantom lines and forming no part of the claimed design;

FIG. 2 is a top plan view of the cap;

FIG. 3 is a bottom plan view of the cap;

FIG. 4 is an elevational view of the cap, other elevational views thereof being identical; and,

FIG. 5 is an isometric view of the bottom of the cap. 

The ornamental design for a unique cap which converts a cup into a high quality shaker, as shown and described. 